Valve-operating mechanism.



4F. KRAMER.

V VALVE OPERATING MEOHANISM.

urmonmn' FILED my 25, 1911.

Patented Feb.20, 1912.

' 3 SHEETS8HEET 1.

lwue/wtoz P. KRAMER. VALVE OPERATING MECHANISM.

"urmoulon Him: nuns, 1 11. 1,017 977 s sums-seem 2.

Patented Feb. 20'

8 .w 9@ 1 w M 6 2 OJ 2 72 a Z 2 4 F \4 6 19a mfifl 4 M z 9 a L awuento'aP. KRAMER. V VALVE OPERATING MECHANISM. APPLICATION FILED MAY 25,1'911.-

1,017,977. Patnted Fe 0, 1912 3 SHEETS-SHEET 3.

.1 @9 M w Z5- Z? I A 3*40 UNITED STATES PATENT OFFICE.

FERDINAND KRAMER, OF GREEN TIMBER, IDAHO.

vatvn-ornmrme MECHANISM.

-description of the invention, such as will enable others skilled in theart towhich it appertains to make and use the same.

My invention relates to, new and. useful improvements, in valve gearsfor engines and more especially to that class of radial valve gears inwhich the amount of lead, variable cutoff, and expansion in reverseaction is obtained from one eccentric, crank, or radial to which an armis attached having its outer end pivoted in a guide, and the object ofmy invention is toprovide an improved reverse block mechanism for valvegears of the above described character. 3

A further object of my invention is to provide a reverse block providedwith split bearings, so arranged that they may be readily adjusted totake up all wear. And a still further object of my invention is toprovide a reverse block whichwill be accurate in operation, and whichwill not knock or. pound.

With these and other objects in view, my invention will be more fullydescribed. illustrated in the drawings and then specifically pointed outin the claims, which are attached to and form a part of thisapplication.

Figure l is a side elevation partly in section of a part of a locomotiveembodying my invention. Fig. 2 is a top plan view of the reversing blockmechanism. Fig. 3 is a detail side elevation of the reversing block.Fig. 4 is a detail top plan view of the same, and Fig. 5 is adiagrammatic view representing the motion of the reversing block.

Referring more specifically to the drawings in which similar referencenumerals designate corresponding parts throughout and which show myreverse block applied to the valve gear of a locomotive, 2 is the maindriving axle, 1 is one of the driving wheels, 3 one of the forward truckwheels, 4 a portion of the forward truck, 5 one of the cylinders, 6 thesteam chest, 7 the valve, 8 a portion of the main frame of the engine,and 9 a part of the main frame on the opposite I side of the engine.

10 is a crank pin to which is connected Specification of Ietcers Patent.

Application filed Mag 25, 1911. Serial No. 629,421.

- one end of the rod 11, the other end of which is connected to thecross head 12 mounted in the cross head guards 13.

Keyed upon the main driving axle 2 is an eccentric 14 provided with thecustomary eccentric strap'15, which strap has an up- Patented Feb.20,1912.

ward extension 16 carrying a crank pin 17 to which is secured by one endthe connecting rod 18, the other end of which is pivotably' secured toone end oft-he valve operating arm 19, said arm being pivotably mountedon the frame as at 20. A connecting rod 21 joins the other end of thisarm with the valve 7. The extension 16 is also provided with a pin 22the purpose of which will be hereinafter explained. I

Suitably journaled in the frame isa rocl:

shaft 23 upon which is keyed the crank arm 24 and a connecting rod 25joins this crank arm with a reverse lever of the locomotive by whichmeans saidshaft may be rocked. Keyed upon one end of this rock shaft23-is the reverse block, which as a whole is designated by the numeral26. I

The reverse block 26 consists primarily of a-body member 27 the centralportion of which is provided. with a bore 28 by means of which said bodyportion is keyed upon the rock shaft 23. This body portion as shown issubstantially elliptical in form and provided at either end withenlargements 29 and 30 the outer portions of' which are out away to formbearing faces 31 and 32,esaid i bearing faces being further cut away toform thehalf bearings 33 and 34. Bearing blocks 35 and 36 provided withhalf bearings 37 and 38 respectively are secured to these bearing facesby means of tapped bores 39 and bolts 40. As will be readily understoodthe bearings thus formed may be readily adjusted by the bolts 40 totake, up

any wear and journaled in these hearings are the crank pins 41 and 42,said crank pins extending entirely throughthe bearings and beingprovided at .their rear ends with flanges 43 and 44 while they areprovided at their outer ends with the crank arms 45 and 46 respectively,which as best shown in Fig. 4 of the drawings are substantially .Z-shaped to conform with the body member. The free ends of each of saidcrank arms is provided with an outwardly extendingcrank pin, that of thecrank arm 45 being designated by the numeral 47 while that of the crankarm 46 is designated by the numeral loo in bearings 49 and 50respectively, one adjacent either end of the bearing block 51, whichblock as shown is also provided with a centrally located bearing 52 inwhich is journaled the pin 22 of the eccentric strap. As shown, thebearing block 51 is composed of two members, adapted to be securedtogether b, means of bolts 53 and the nuts 54, in such a manner as torender them readily adjustable for taking up all wear.

As shown in Fig. 1 of the drawings the reverse block is in position toactuate the valve for a downward .motionof the engine, the driving axle2 upon being revolved raising the eccentric strap and through thereverse block and connecting rod opening the valve 7 to admit steam infront of the piston. If the hand lever is operated to reverse the block26 it will be readily seen that said block will-cause the valvecontrolling levers to move in the opposite direction, which will reversethe engine.

The diagrammatic view shown in Fig. 5 of the drawings best representsthe motion of the reverse block. In this view a represents the block 51,b the crank arm and 0 the crank arm 46, said arms being shown with theblock at the center of its stroke. As the eccentric is further operatedthe arm I) is revolved until it reaches the position 6 while the arm 0is revolved until it reaches the position 0 when a will assume theposition shown at a, which shows the top of the stroke. A furtherrevolving of the eccentric moves these portions back to the centralposition, and then downwardly to the position shown at a", b, and 0. Inthis diagram Z represents the position of the pin and as shown at (Z andd this pin 17 moves in an absolutely straight line and it will thus beseen that the valve action will always be free.

From the above description it will readily be understood that I haveconstructed a reverse block mechanism which is extremely simple in itsoperation and in which all the bearings are so formed as to permit ofready adjustment for taking up the wear of the parts.

What I claim is 1. The combination with a rock shaft and an eccentricstrap having an extended arm, of a reverse block for valves, comprisinga body keyed upon said shaft and at each end with a split bearing, pinsrotatably mounted in said bearings, crank arms carried. by said pins, alink pivotably connecting the 'free ends of each of said crank arms,said link being provided with a centrally located bore adapted to engagewith the arm of the eccentric strap.

2. The combination with a rock shaft and an eccentric strap having anextended arm provided with a pin, of a reverse block for valves,comprising a body keyed upon said shaft, a crank pin journaled in eachend of said body, crank arms carried by said pin and provided at theirfree ends each with a second crank pin, a split bearing block eachmember of which is provided with a plurality of half bearings, means foradjustably securing said members together to form a plurality ofbearings, one of said second mentioned crank pins being journaled in abearing in one end of said block, the other of said crank pins beingjournaled in a hearing in the other end of said block, and the pin ofsaid extended eccentric strap being journaled in a bearing centrallylocated in said block.

In testimony whereof, I affix my signature, in presence of twowitnesses.

FERDINAND KRAMER.

YVitnesses I R. D. MERRILL, IV. L. Ronn'son.

rovided

